Pubertal Maturation, Hormonal Levels And Body Composition In Young Gymnasts And Age-matched Controls
Notice bibliographique
Résumé
Puberty is characterized by large hormonal changes, resulting in both physical and sexual maturation. Intense training and low body fat has been found to delay the onset of puberty in females by altering normal hormonal development. In males, despite evidence that physical activity can also result in hormonal changes, intense gymnastics training has not been associated with changes in the onset of puberty, if body composition is within normal range. PURPOSE To assess sexual maturation, hormonal levels, and body fat among competitive male and female Canadian gymnasts and age-matched controls. METHODS The gymnastics group, comprised of 21 male (13.3 ± 0.3y) and 18 female gymnasts (13.4 ± 0.2y), was compared to 24 age-matched male (13.5 ± 0.3y) and 24 female (13.9 ± 0.1y) controls. Sexual maturation was self-assessed using the Tanner Scale. For the male subjects, testosterone levels were determined from saliva samples. For the female subjects, progesterone and estradiol (17-β) were measured from blood samples. For menstruating subjects, age at menarche was reported and blood draws were performed twice: in the follicular and luteal phase of the menstrual cycle. Relative body fat (%BF) was assessed using bioelectrical impedance analysis. RESULTS There were no significant differences between the male gymnasts and controls in salivary testosterone (43.3 ± 5.8 vs. 38.2 ± 4.1 pg ± ml−1), genital development (stages: 3.2 ± 0.2 vs 3.5 ± 0.1) or pubic hair development (stages: 3.5 ± 0.1 vs. 3.6 ± 0.1). Male gymnasts were similar in size, but had significantly (p≤0.05) lower %BF than the controls. Female gymnasts were significantly (P≤0.01) smaller, and had significantly (P≤0.01) lower body fat than female controls. Twenty-one female controls and one gymnast were menarcheal, with the average age at menarche being 12 ± 0.1y for the controls, and 13 for the menarcheal gymnast. Serum estradiol and progesterone levels for the pre-menarcheal gymnasts were similar to those measured in the controls during the follicular phase, which were significantly lower (P≤0.01) than those measured during the luteal phase. Breast development was delayed in female gymnasts compared to controls (stages: 2.7 ± 0.2 vs 3.8 ± 0.1), while the difference between the groups in pubic hair development did not reach significance (stages: 3.1 ± 0.2 vs 4.0 ± 0.2). CONCLUSION While the intense training by the young male gymnasts resulted in a decreased %body fat, there was no apparent alteration in the timing and extent of their physical and pubertal development. On the other hand, a delayed menarche, reduced physical and sexual maturation, and a low %body fat were found in the females engaged in gymnastics training.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».